Warp let-off mechanism for looms



' Dec. 18, 1928. 1,695,361

J. BERNINI WARP LET-OFF MECHANISM FOR Locus Filed Oct. 18, 1927 2 Sheets-Sheet 1 T/oZu 677221 4? Inventor I J Attorney Dec. 18, 1928.

- 1,695,361 J. IBERNINI WARP LET-OFF MECHANISM FOR LOOKS Filed Oct; 18. 1927 2 Sheets-Sheet 2 Inventor 5 1 Few/413 1 Attarnqy Patented Dec. 1 8, 1928.

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A plication j-Fee1-20btebew18,' 1927. serial noaaaaeoa The present invention r'ela'tes toimprover ments in warp let" ofl' mechanism forlooms such as is disclosed in Letters Patent- N0.

- 1,622,757 dated'Mareh29, 1927i r s An important object 05f the invention resides in the provision ofa standard beam head particularlyrwellsadaf ed-for moi-lilting I i'ng fro'man angle' insteadof"the'usual weight.

With "the above-ma "mt-H0118 other 1 objects'in View as will eppeer as the description roceeds; the "invention resides in-"oertar-n combination an'd air a'ngernentfofzparts:as will be hereinafter more fully i described and claimed.

Figure '1' is "an elevation of the mechanism embodyin thefeatures ofmyinvention,

"Figuree is another elevation thereof taken at right anglesto that-shown in 'liigure; 1,

showing portions 013 "the sections :--and the worm gear 'being omitt'ed for clarity.

Figure "3"is a fragmentary side elevation showing portions of a machine with my imp'rov'ed'l'et 'o'fl mechanism mounted thereon,

Flgure-1' -is"an elevation'of' oneot thecaps, Figure 5 is another elevation theneof, Figure dis" a'd'etail 'viewofi l'th'e springs,

Figure 7 is a' toplplan viewshowing a.==por- 'lshowing a modificationm a -Referrin to tlie drawin in detail it will be seen "that the numeral denotes: a" gear formed with anannular member 8 projecting into a ring 5 '-and onwhich thisrlng 5*1s rov tatable. A pinion 9 and a Worm gearlQare j oined' "togethenand are "rotatable on "a -'stud 14 projecting from the ring 5. The pinion. ameshes with the'gear 7 and the worm gear 10 meshes With aworm 11. I This Worm 11 is journaled between ears 12 and 13 projecting from the ring 5. A ratchet, 15 is fixed on a shaft forming part of the worm 11 and designated specifically by the numeral 17 A lever 16 is rotatable on the shaft 17. A spring pressed pawl 30 is mounted on the lever 16 for engaging the ratchet wheel 15. A spring 31 is fixed at one end to the lever 16, coiled about the lever huband anchored to the ears 12 for normally holding the lever and returningit to a predetermined posi-- tion. A small lever-19 on the pawl 30 is pro vided for releasingthisspring pressed pawl from engagement with the ratchet 15.

In Figure 3 I havegiven -a fragmentary illustration of the mounting ofthe mecha- -nism, on a-loom. Alink 33 is'anchored-in a ,hole 20 01? the ring 5 andtastened to an arm :21. Springs 22-are disposed at an a-ngleto the arm 21 and are anchoredtothelower loom .brace 23'for imparting tension to the warp :beam and for compensating the shedding.v

, I I At every pick of the loom, theWar-p'threads will rise and falzl -with the harness frame forming the open and-closedshed. .As the shed opens, the Warp threads are drawn IIOHI'ZL straight line and assume-a longer-disytance; This will-cause-thewarp 'b'eam to -roc k, setting the weights in a vertical oscillation, It is apparent that the Weight in -motion, due to inertia will impart an irregular tension onthe warp'threads and will not synchronize with the' motionof the shed,

"especially when the loom is set in operation. Ifwthe customary method of using weights i'or- 'tensioning 18 used, the let off mechanism will. compensate for the taking up of the warp bythejtake up motion but will depend onggravit-y to compensate for the motion of The positive harness motion or head of I a loom of the gem type can be operated by handindependent of the loom motion and I 1 =will 'use it,;toillustrate the points attempted to be madein theahove paragraph. If the loom is stopped and the head Emotion is .unlocked, we can turnthehand crank opening and close the shed. The opening. and closing" ofthe shed will cause the warpbeamto rock and the Weight tomove up and down. When I start to turn the hand crank-of the head inotionopening the -shed the warp thneads will'have to overcome that property oflthe weight at rest to remain so-and as-We keep on turning J (opening-and closing I thelshed) the warp beams will rock and Weight move up and down the warp threads will have to overcome the property of the weight in motion tocontinue in the same'direction (up or down); This is what I mean by inertia, weight in motion causing irregular tension. on the warp threads if weights are used.

To eliminate gravity and to reduce inertia I use springs 22 and make their use practical for warp tensioning and to compensatethe shedding by applying the same in such a manner as to form an angle with the arm 21.-

gear 7 to turn until the slack of the warp threads is taken up. This will stop the gear and cause the ring to move up pulling the arm 21 away from the stop 25. The pull of the springs will tension the Warp and the ring wi l be turned up to the desired position when the lever 16 touches the extreme striking point of the lay rod. As the loom is set in motion, the striking rod 26 will move back and forth (moved by the leg or other suitable part of the loom). The warp is taken up by the'take up motion. The striking rod 26 strikes the lever 16 which turns the worm and causes the rotation of the worm gear thereby as the pinion which in turn causes the ring to travel about the gear. This will allow the gears (and warp) to move ahead while the ring will remain in the same position. The faster the warp is drawn up the longer will be the sweep of the lever 16' and quicker the motion of the worm and pinion and the gear causing the ring to move back faster thus keeping the same position.

If desired gear 7 can be a worm gear and worm 11 made to mesh with. it by changing cars 12 and 13 to a suitable position thus eliminating the intermediate gears (pinion and worm gears).

It is obvious that handle 27 is used to turn the worm in adjustment of the ring. The amount of pull of the spring is regulated by turning the handle 28.

It is thought that the construction, opera tion, utility and advantages of this invention will now be apparent to those skilled in this art without a more detailed description thereof. The present embodiment of the invention has been disclosed in detail merely by way of example since in actual practice it attains the features of advantage enumerated as desirable in the statement oi? the lnvention in the above description. Itwill be apparent'that changes lIl tllG de tails of construction, and in the combination and arrangement of parts may be resorted to without departing fromthe sp1r1t or scope 1? the invention as hereinafter claimed or sacrificing any of its advantages.

Having thus described my invention, what I claim as new is:

1. A mechanism of the class described, includin in combination, a gear adapted to be secured to a warp beam, an annular member on the gear, a ring about the annular memher, a pinion meshing with the gear, a lever, means pivotally mounting the lever onthe ring-means for rotating the pinion by oscillation of the lever, spring means associated with the lever for holding it in predetermined position, a link engaged with the ring, a lever, means tor pivotally mounting the second mentioned lever at one end of the frame oi a loom, and spring, tension means engaged with the second mentioned lever at an angle thereto. V V

2. A mechanism of the class described including, in combination, a :gear adaptedto e secured to a warp beam, an annular member on the gear, a ring about the annular member, a pinion meshing with the gear, a lever, means pivotal'ly mounting the lever on the ring, means for rotating the pinion by oscillation of the lever, spring means associated with the lever for holding it in. a predetermined position, a link engaged with the ring, a lever, means for .pivotally mounting the second mentioned lever at one end of the frame of a loom, and spring tension means engaged with the second mentioned lever at an angle thereto, said means comprising a pair of springs, means for anchoring the springs to a portion of the loom frame, and adjustable means for anchoring the springs to the other end of the second mentioned lever so that said springs will be disposed at an angle to the lever. V

3. A mechanism of the class described including, in combination, a gear adapted to be secured to a warp beam, an annular member on the gear, a ring about the annular member, a pinion meshing with the gear, means for rotating the pinion, a lever, means for pivotally mounting the lever to one end of the frame of the loom, and spring tension means engaged with the lever at an angle thereto. i V

, In testimony whereof I afiiX my signature.

JOHN BERNINI. 

